MEBS6008 Environmental Services II

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Space Air Diffusion I

1.  Basic Principles

• Objectives and considerations
• Draft and effective draft temperature
• Air diffusion performance index (ADPI)
• Space diffusion effectiveness
• Ventilation effectiveness

2.  Air Jets

• Free isothermal jets
• Design factors
• Confined air jets
• Free nonisothermal jets

3.  Outlets and Inlets

• Supply outlets
• Return inlets
• Performance data

4.  Mixing Flow

• Airflow patterns
• Principles and characteristics
• Outlet classification
• Design considerations
• Design procedure

[Download PowerPoint file (1.2 MB)]

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References:

• ASHRAE, 2001. ASHRAE Handbook Fundamentals 2001, SI ed., Chp. 32, American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Atlanta, GA. [AV 697 A82 H02 (Handbook CD)]
• HVACMA (Heating Ventilating and Air Conditioning Manufacturers Association), 2000. Guide to Air Distribution Technology for the Internal Environment, Federation of Environmental Trade Associations, Marlow, Bucks, UK. [P 697.932 G9]
• Rock, B. A. and Zhu, D., 2002. Designer's Guide to Ceiling-based Air Diffusion, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Atlanta, GA. [697.92 R68]
• Wang, S. K., 2001. Handbook of Air Conditioning and Refrigeration, 2nd ed., Chp. 18, McGraw-Hill, New York. [697.93 W24 h][* available in eBook]

Web Links:

• Price HVAC (equipment catalogue and design guide)
• Air Distribution Engineering Guide
• Terminal Unit Engineering Guide

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| Created: Nov 2004 | Update: 22 Feb 2005 | By: cmhui@hku.hk |